Prince William and Kate Middleton's wedding will not an official state occasion but their might be some royals though I'm not sure how senior since William has not gone to other royal events that involve other royals that much.

The SRF, absent again in the royal circle
No representative at the christening of Princess Estelle

F&L not attending the christening of Prince Vincent of Denmark or Ingrid Alexandra of Norway (where Felipe is a godfather).

I am curious if they will attend the Luxembourg wedding - in theory yes, Guillaume is the heir.

Their keeping a very low profile at the moment,seems to be all duty .Let's hope we don't have a confusing situation like the Monegasque Princely Wedding last year.The King is attending,no he's not,Infanta Pilar may go instead,no she's not,the Royal family are all far too busy..its a Saturday!

I found this article about Letizia and her relationship with other royals... I find it interesting, that it seems, she hasn't got so good friendship with the other royals, although Felipe was before the marriage often guest on occassions, celebrations with royals... And if I am correct Letizia is not godmother of any royal baby, it says something about her relationship with other royals...Cuando Letizia dice no - Blogs de Princesa LZhttps://translate.google.hu/translat...%2F&edit-text=

I found this article about Letizia and her relationship with other royals... I find it interesting, that it seems, she hasn't got so good friendship with the other royals, although Felipe was before the marriage often guest on occassions, celebrations with royals... And if I am correct Letizia is not godmother of any royal baby, it says something about her relationship with other royals...Cuando Letizia dice no - Blogs de Princesa LZhttps://translate.google.hu/translat...%2F&edit-text=

Gossip magazine Vanitatis about Letizia again...
Felipe and Letizia attended at the heirs' meeting in the Netherlands and from the photos from the wedding of Frederik and Mary and Victoria and Daniel we have seen her interacting friendly with other royals. She and Camilla seemed to get along very well and with Maxima she seems to have a very warm relationship.

Paloma Barrientos has been a chronicle Letizia hater for years, maybe she is not, just her website has been supported financially by some rich (noble) people who hate Letizia. Either way. After they saw Felipe and Letizia were so happy and in love at their anniversary day, they had to write some nonsense, it's getting so predictable.